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Simplifying -9(1 + n) = 3(n + -3) (1 * -9 + n * -9) = 3(n + -3) (-9 + -9n) = 3(n + -3) Reorder the terms: -9 + -9n = 3(-3 + n) -9 + -9n = (-3 * 3 + n * 3) -9 + -9n = (-9 + 3n) Add '9' to each side of the equation. -9 + 9 + -9n = -9 + 9 + 3n Combine like terms: -9 + 9 = 0 0 + -9n = -9 + 9 + 3n -9n = -9 + 9 + 3n Combine like terms: -9 + 9 = 0 -9n = 0 + 3n -9n = 3n Solving -9n = 3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3n' to each side of the equation. -9n + -3n = 3n + -3n Combine like terms: -9n + -3n = -12n -12n = 3n + -3n Combine like terms: 3n + -3n = 0 -12n = 0 Divide each side by '-12'. n = 0 Simplifying n = 0
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